package org.nokatag.system;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
/**
 * 编码拦接器
 * @author rebin
 *
 */
public class SetCharacterEncodingFilter implements Filter{

	public void destroy() {
		this.encoding = null;
        this.filterConfig = null;
	}
    public void doFilter(ServletRequest request, ServletResponse response,FilterChain chain) throws IOException,
            ServletException {

        if (ignore || (request.getCharacterEncoding() == null)) {
            String encoding = selectEncoding(request);
            if (encoding != null) {
                request.setCharacterEncoding(encoding);
            }
        }
        chain.doFilter(request, response);
    }
	public void init(FilterConfig filterConfig) throws ServletException {
		this.filterConfig = filterConfig;
        this.encoding = filterConfig.getInitParameter("encoding");
        Concest.ENCODING=this.encoding;
        String value = filterConfig.getInitParameter("ignore");
        if (value == null) {
            this.ignore = true;
        } else if (value.equalsIgnoreCase("true")) {
            this.ignore = true;
        } else if (value.equalsIgnoreCase("yes")) {
            this.ignore = true;
        } else {
            this.ignore = false;
        }
	}
    protected String selectEncoding(ServletRequest request) {

        return (this.encoding);

    }
    protected String encoding = null;
    protected FilterConfig filterConfig = null;
    protected boolean ignore = true;

}
